* * *

Goodreads is much more international than Amazon, foreign users won’t realistically order from Amazon.com and might not have a local Amazon.xy site. For a time, one of the most active demographics on Goodreads was young female Iranians.

As noted in the article they already do this.

The irony to make this suggestion on this article about people commenting on things they didn't read.

Not only might you not have purchased from Amazon and instead bought it some other way, but

* Most early reviews are via ARCs (Advance Reading Copies) which you get through netgalley and similar sites, or directly from the author/publisher

* It is quite likely that you're reading something (legally) without having bought it because libraries exist

* Just because you bought it, doesn't mean you read it, and you might be tempted to leave a one-star review based on the fact that it shipped slowly and arrived late